Corsica Sardinia 4x4 off-road trip

We make this trip at June. Start from Latvia - Lithuania - Polska - Check Republic - Austria - Italy - Corsica (France) -Sardinia (Italy)- than back home. Total we made 6500 km, from them 500 km was light and medium off-road. We slept near beaches and remote areas, sometimes we drive in campsite, because near beach all is close (particularly in Corsica). Corsica have more hills, and it is different from Sardinia. Sardinia have more good people, more friendly and polite. But in Sardinia disel and petrol is